CN113381964B

CN113381964B - Method, system and storage medium for transmitting data in indoor distribution system

Info

Publication number: CN113381964B
Application number: CN202010156761.1A
Authority: CN
Inventors: 王刚; 熊尚坤; 赖苏; 张光辉; 向剑虹; 王大学; 罗玉强; 余勇志; 刘洋; 刘杰; 黄婧; 涂乐飞; 徐晓民
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2022-08-02
Anticipated expiration: 2040-03-09
Also published as: CN113381964A

Abstract

The present disclosure relates to methods, systems, and storage media for transmitting data in an indoor distribution system. According to an aspect of the present disclosure, there is provided a method for transmitting data in an indoor distribution system, the method may include selecting a compression method according to transmission requirements and a transmission rate of an ethernet, and compressing data to be transmitted using the compression method; mapping the compressed data to a Common Public Radio Interface (CPRI) frame for sending on an optical fiber; and mapping the received CPRI frames into ethernet frames for transmission over the ethernet network line.

Description

Method, system and storage medium for transmitting data in indoor distribution system

Technical Field

The present disclosure relates to data transmission, and more particularly, to a method, system, and storage medium for transmitting data using ethernet in an indoor distribution system.

Background

A Pico base station (Pico) indoor distribution system may include devices such as a master indoor baseband processing unit (BBU), a Remote Hub (RHUB), and a Pico base station radio remote unit (pRRU). Each pRRU is provided with an Ir electrical port (Ir refers to an interface between the BBU and the RRU), the electrical port is connected with one electrical port on the RHUB through a super-six-type network cable, and the RHUB supplies power through the electrical port. The pRRU is mainly responsible for medium radio frequency processing and antenna interface of uplink and downlink signals of the base station, and the RHUB is mainly responsible for data distribution and aggregation functions from an Ir optical port between the RHUB and the BBU to an Ir electrical port between the RHUB and the pRRU.

The Common Public Radio Interface (CPRI) alliance is an industry partnership project, and is dedicated to the establishment of the major interface specifications between the radio equipment control center (REC) and the Radio Equipment (RE) within a radio base station. Companies that initiate the formation of CPRI organizations include: ericsson, huashi, NEC, nortel networks and siemens, CPRI is open to other organizations and manufacturers. The current latest version of CPRI is 7.0. When the CPRI interface is used to transmit data, an optical fiber must be used, and in an indoor distribution system, it is more troublesome to deploy an optical fiber as compared with deploying a network cable, and the cost of an optical module is higher.

To avoid consuming a large amount of bandwidth, the data to be transmitted needs to be compressed before being mapped into CPRI frames for transmission. The compression methods commonly used in the industry, such as a law, mu law, block floating point, etc., have the problems of complex hardware implementation, higher hardware resource overhead, increased time delay, etc.

Disclosure of Invention

The following presents a simplified summary of the disclosure in order to provide a basic understanding of some aspects of the disclosure. However, it should be understood that this summary is not an exhaustive overview of the disclosure. It is not intended to identify key or critical elements of the disclosure or to delineate the scope of the disclosure. Its sole purpose is to present some concepts of the disclosure in a simplified form as a prelude to the more detailed description that is presented later.

According to an aspect of the present disclosure, there is provided a method for transmitting data in an indoor distribution system, the method may include selecting a compression method according to transmission requirements and a transmission rate of an ethernet, and compressing data to be transmitted using the compression method; mapping the compressed data to a Common Public Radio Interface (CPRI) frame for sending on an optical fiber; and mapping the received CPRI frames into ethernet frames for transmission over the ethernet network line.

According to another aspect of the present disclosure, an indoor distribution system for transmitting data using ethernet is provided. The system may include a first electronic device including at least one processor and a memory having stored therein executable instructions that, when executed by the at least one processor, cause the at least one processor to select a compression method by which to compress data to be transmitted according to transmission requirements and a transmission rate of an ethernet network; and mapping the compressed data to Common Public Radio Interface (CPRI) frames for transmission on the optical fiber. The system may also include a second electronic device comprising at least one processor and a memory having stored therein executable instructions that, when executed by the at least one processor, cause the at least one processor to map one or more received CPRI frames into ethernet frames for transmission over an ethernet network line. The system may also include a third electronic device including at least one processor and a memory having stored therein executable instructions that, when executed by the at least one processor, cause the at least one processor to receive an ethernet frame over an ethernet network.

According to another aspect of the present disclosure, there is provided a non-transitory computer-readable storage medium having stored thereon executable instructions that, when executed by a processor, cause the processor to perform a method according to the present disclosure.

According to another aspect of the present disclosure, there is provided an apparatus for transmitting data in an indoor distribution system, which may include means for performing a method according to the present disclosure.

According to one or more embodiments of the present disclosure, deployment of an ethernet line in an indoor distribution system is more convenient and faster than deployment of an optical fiber, and the cost is lower, and a suitable compression method is selected to compress data, so that CPRI frames are mapped to ethernet frames, which can conform to an ethernet transmission protocol, and capacity of a pRRU can be maximized within a limited bandwidth, and data transmission between an RHUB and the pRRU can be completed by using the ethernet line.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure. The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram illustrating an indoor distribution system using ethernet to transmit data according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram illustrating a CPRI basic frame structure according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram illustrating a basic group of custom Ethernet frames according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating a method for transmitting data in an indoor distribution system according to an embodiment of the present disclosure; and

fig. 5 is a schematic diagram illustrating a first electronic device included in an indoor distribution system for transmitting data using ethernet according to an embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The present disclosure provides a method, system, and storage medium for transmitting data using ethernet in an indoor distribution system. In the embodiment, compared with the deployment of optical fibers, the deployment of the Ethernet lines in the indoor distribution system is more convenient and quicker and has lower cost, and the data is compressed by selecting a proper compression method, so that CPRI frames are mapped into Ethernet frames, the Ethernet frames can conform to the Ethernet transmission protocol, the capacity of pRRU can be maximized in a limited bandwidth, and the data transmission between RHUB and pRRU can be completed by utilizing the Ethernet lines.

Fig. 1 is a schematic diagram illustrating an indoor distribution system 100 for transmitting data using ethernet according to an embodiment of the present disclosure.

In some embodiments, the indoor distribution system 100 may include a core network 101, a packet transport network PTN 102, one or more BBUs 103a, 103b (only two shown by way of example in fig. 1 and collectively referred to hereinafter for brevity as BBUs 103), one or

more RHUBs

104a, 104b (collectively referred to hereinafter for brevity as RHUBs 104), and one or

more prrus

105a, 105b (collectively referred to hereinafter for brevity as prrus 105). Each RHUB104 is provided with a plurality of Ir optical ports, and is used for Ir interface with the BBU 103 (for example, via an Ir optical channel 110) and for cascade connection between the RHUBs 104 (for example, via an Ir optical channel 120), and the maximum number of cascade connections supported by the RHUB104 is 4; each RHUB104 also has 8 Ir electrical ports thereon, and a single RHUB104 can be directly connected to up to 8 prrus 105 (e.g., via Ir electrical channel 130).

The BBU 103 receives packet data from the core network 101 through the PTN 102.

The RHUB104 is a device of an indoor distribution system and mainly comprises the following functions: the system comprises a data distribution and aggregation function from an Ir optical port between the RHUB104 and the BBU 103 to an Ir electrical port between the RHUB 105, a cascade function from the Ir optical port between the RHUB104 to the Ir optical port, a system clock and system synchronization function acquired from the BBU 103 through the Ir optical port and the like.

The primary functions of pRRU105 include, but are not limited to, intermediate radio frequency processing of base station uplink and downlink signals and antenna interface. Compared with the common RRU, the pRRU105 has smaller volume and power, and both power supply and connection with the BBU 103 must pass through the RHUB 104; otherwise, the software and hardware functional aspects of pRRU105 are substantially the same as for normal RRU.

A process of transmitting data using ethernet in the indoor distribution system 100 will be described below in conjunction with CPRI frames and ethernet frames.

To avoid consuming a large amount of bandwidth, the BBU 105 performs compression processing on the data to be transmitted. In some embodiments, the BBU 103 may select a compression method according to the transmission requirement and the transmission rate of the ethernet, and compress the data to be transmitted by using the compression method. In some embodiments, BBU 103 may map the compressed data to CPRI frames for transmission over optical fiber. In some embodiments, the RHUB104 may map one or more received CPRI frames into ethernet frames for transmission over the ethernet network line. In some embodiments, pRRU105 may receive an ethernet frame over an ethernet network.

In some embodiments, the data to be transmitted may include quadrature in-phase (IQ) data obtained by sampling. The IQ data is two paths of baseband signal data which are orthogonal, and the maximum IQ data sampling width of the system is usually 16 bits (bit). In some embodiments, BBU 105 determines the compression rate based on the transmission requirements and the transmission rate of the ethernet. In some embodiments, the transmission requirements include one or more of: the number of cells, the number of antennas, and the cell bandwidth supported by the device.

In some embodiments, when 14 antenna New Radio (NR)100MHz carrier (reference sample rate of 122.88Msps) and 2 antenna 20MHz Long Term Evolution (LTE) carriers (reference sample rate of 30.72Msps) are to be transmitted, IQ data is at a data rate of 4 x 122.88 x 32+2 x 30.72 x 32-19660.8 Mb/s in 16 bits. When the ethernet is a gigabit ethernet, i.e., the transmission rate is 10Gb/s, the data to be transmitted should be compressed, and the compression rate should be slightly greater than 1/2 considering that the control information in the frame is not used for transmitting IQ data.

For a compression method to achieve a compression ratio slightly greater than 1/2, a compression method in which multiple sampling points take an Automatic Gain Control (AGC) factor is used in some embodiments. In some embodiments, a compression method may include determining an AGC factor for one or more IQ data. In some embodiments, the compression method may further include determining a number of bits to be shifted for each IQ data according to the number of bits represented by the AGC factor, and performing compression processing by shifting each IQ data from high except for the highest sign bit by a corresponding number of bits, respectively, and leaving a certain number of bits for the remaining portion including the sign bit toward low, to obtain compressed IQ data. In some embodiments, the compression method may further include transmitting the compressed IQ data and the AGC factor.

In some embodiments, determining the AGC factor may include taking a data having a largest absolute value among the one or more IQ data as a reference value. In some embodiments, determining the AGC factor may further include searching the reference value bit by bit from the highest sign bit to the lower bits until the first bit different from the sign bit is searched. In some embodiments, determining the AGC factor may further include binary quantizing the number of bits searched for that are the same as the sign bit except for the sign bit, denoted as the AGC factor. In some embodiments, the plurality of IQ data may have the same AGC factor. In some embodiments, each IQ data may have a corresponding AGC factor, respectively.

In some embodiments, the particular number of bits reserved for the lower bits depends on the compression rate and the number of bits of the AGC factor. In some embodiments, transmitting the compressed IQ data and the AGC factor may comprise, as compressed data, every two adjacent compressed IQ data following one bit of the AGC factor.

In some embodiments, a 4-bit AGC factor is used for 16-bit IQ data, and the set of compression methods used is exemplarily illustrated with 4 consecutive samples of IQ data (two for IQ data, and thus 8 for IQ data). When the compression rate should be slightly less than 1/2, considering that a 4-bit AGC factor is transmitted together with 4 sample data, 16-bit IQ data should be compressed to 7-bit. The data with the largest absolute value among the 8 IQ data is used as a reference value. And searching the reference value from the highest sign bit to the lower bit one by one until the first bit different from the sign bit is searched, and binary quantizing the bit number of the searched bit which is the same as the sign bit except the sign bit and recording as an AGC factor. Assuming that 3 bits are the same as the bit value of the sign bit except for the highest sign bit, the AGC is noted as 0011. 3 bits (the 3 bits do not contain a sign bit) are removed from the upper bits except for the highest sign bit for each 16-bit IQ data, and then 7 bits (the 7 bits contain a sign bit) are reserved to the lower bits for the remaining part (the remaining 12 bits) to obtain compressed IQ data. During transmission, each sampling point (which can be regarded as every two adjacent compressed IQ data) follows one bit of the AGC factor (4 sampling points follow 4 bits of the AGC factor), and the sampling points together serve as compressed data. The data of each sample point is compressed from 32 bits before compression to 14+ 1-15 bits, achieving a compression ratio slightly exceeding 1/2.

In some embodiments, the BBU 103 mapping the compressed data to CPRI frames for transmission from the BBU 103 to the RHUB104 over the optical fiber comprises: a CPRI protocol having a line rate closest to the transmission rate of the ethernet is determined. In some embodiments, the method further comprises determining the number of compressed data mapped into the CPRI basic frame according to transmission requirements and the CPRI basic frame structure under the CPRI protocol. Fig. 2 is a schematic diagram illustrating a CPRI basic frame structure according to an embodiment of the present disclosure.

When the Ethernet is a gigabit Ethernet, the CPRI protocol with the closest transmission Rate to 10G Ethernet is CPRI Line Bit Rate Option 8:10137.6Mbit/s, 64B/66B coding, with an effective Rate of 9830.4 Mbit/s. A CPRI frame of 10ms has 150 superframes, each having 256 basic frames, and the basic frame structure is shown in fig. 2.

The basic frame has 16 slots, each slot having 160 bits, wherein the Control Word (CW)201 has 128 bits, is located in the slot shown in the first column, and is reserved for transmitting information such as frame number, synchronization/timing, reset, power down alarm, etc., including Fast control and management domain (Fast C & M domain) for ethernet channel, and CW 201 cannot be used for IQ data transmission. The payload 202 of the basic frame has 2432 bits (actually corresponding to 304 bytes) and can be used for transmitting IQ data. Since the rate of each basic frame is 3.84Msps, the net rate of IQ data is 2432 × 3.84 — 9338.88 Mb/s.

For the aforementioned transmission requirement, i.e. when transmitting 1 NR 100MHz carrier with 4 antennas and 2 LTE carriers with 20MHz with 2 antennas, the number of samples to be transmitted per basic frame is 4 × 122.88/3.84+2 × 30.72/3.84 — 160. Each sample point of the compressed data obtained by the above compression method has 15 bits, and the data of 160 × 15 ═ 2400 bits is mapped into the CPRI basic frame, for example, 32 bits of the first column except the control word 201 may be left unused, and 2400 bits may be mapped into the time slots shown in the remaining 15 columns.

In some embodiments, the RHUB104 may receive the CPRI frames over the optical fiber, and the RHUB104 may map one or more of the received CPRI frames into ethernet frames for transmission over the ethernet network line may include: the number of CPRI basic frames mapped to each basic group of ethernet frames is determined. In some embodiments, mapping data contained in each consecutive said number of CPRI basic frames to an IQ data field in a basic group of each ethernet frame is further included. In some embodiments, it also includes mapping the control words 201 contained in the CPRI basic frame to a message channel and a Control Management (CM) channel in the basic group of ethernet frames. Fig. 3 is a schematic diagram illustrating a basic group of custom ethernet frames according to an embodiment of the present disclosure.

A 10ms ethernet basic frame comprises 150 supergroups, each supergroup comprising 64 basic groups, the structure of which is shown in fig. 3. Each basic group includes an ethernet frame and a frame gap (not shown), wherein the frame gap is designed to satisfy that the underlying physical layer (PHY) chip can normally transmit and receive data, and the frame gap occupies 16 bytes in each basic group. In some embodiments, the frame size of the ethernet frame is fixed, for a total of 1264 bytes. The necessary transmission overhead in ethernet frames includes: a preamble 301(8 bytes), a destination address 302(6 bytes), a source address 303(6 bytes), a type/length field 304(2 bytes), and an FCS (frame check sequence) field 310(4 bytes). The effective data structure in the ethernet frame as the actual transmission overhead includes: frame count 305(2 bytes), IQ data 306(1216 bytes), message channel 307(8 bytes), CM channel 308(8 bytes), and reserved (4 bytes).

The length of the ethernet frame itself is supported to be long, and the maximum length is generally limited to 1518 bytes (including the header). In some embodiments, to maximize the capacity of the pRRU within the limited bandwidth, the number of CPRI basic frames mapped to each basic group of ethernet frames is 4. In some embodiments, the data contained in each 4 CPRI basic frames (the data of the payload 202) is mapped to the IQ data field 306 in each ethernet basic group, so the IQ data field is 304 × 4 — 1216 bytes.

In some embodiments, the fast C & M field in the CPRI frame control words is mapped to the message channel 307, and other control words such as frame number synchronization, reset, power down alarm, etc. in the CPRI frame control words are mapped to the CM channel 308.

The message channel 307 mainly has functions of transparently transmitting application layer messages, completing normal message interaction of master and slave devices, version upgrading, log extraction and the like. In the protocol, a message channel is specified to be only 307 for transparent transmission of application layer messages without any coding, and in order to ensure that a receiving end can normally receive the application layer messages in a basic group, a Media Access Control (MAC) frame length field is added on an IEEE 802.3 standard protocol for counting the number of bytes occupied by the whole application layer messages. For a sending end, when an application layer message is transmitted, message bytes are placed at a specified position, and an MAC frame length field is filled; when no message is transmitted, 0 is filled in the message channel 307. For the receiving end, whether the application layer message exists is judged by checking whether the preamble exists on the link in real time, when the preamble is checked, the MAC frame length analyzes the data and carries out Cyclic Redundancy Check (CRC) check, if the CRC is correct, the message is received, otherwise, the message is discarded.

The CM channel 308 is mainly used for interacting the information of the underlying link, such as the information of the radio frame number, the RRUID, the power failure alarm, the protocol version, and the like. The CM channel 308 provides access information for the application layer and simple methods of controlling the slave (remote power down, network switch, etc.). The CM channels 308 occupy the CM channels 308 in each basic group using a time division scheme, cycling through one super group.

In some embodiments, the RHUB104 maps the received CPRI frames into ethernet frames before transmitting them over the ethernet cable. In some embodiments, the ethernet network is a gigabit ethernet network. In some embodiments, pRRU105 receives an ethernet frame over an ethernet network.

Fig. 4 is a schematic diagram illustrating a method for transmitting data in an indoor distribution system according to an embodiment of the present disclosure.

In step M401, a compression method may be selected according to the transmission requirement and the transmission rate of the ethernet, and the compression method is used to perform compression processing on data to be transmitted, and this step may be performed by the BBU 103. In some embodiments, the data to be transmitted may include IQ data obtained by sampling. In some embodiments, the compression rate is determined based on the transmission requirements and the transmission rate of the ethernet. In some embodiments, the transmission requirements include one or more of: the number of cells, the number of antennas, and the cell bandwidth supported by the device.

In some embodiments, a compression method may include determining an AGC factor for one or more IQ data. In some embodiments, the compression method may further include determining a number of bits to be shifted for each IQ data according to the number of bits represented by the AGC factor, and performing compression processing by shifting each IQ data from high except for the highest sign bit by a corresponding number of bits, respectively, and leaving a certain number of bits for the remaining portion including the sign bit toward low, to obtain compressed IQ data. In some embodiments, the compression method may further include transmitting the compressed IQ data and the AGC factor.

In some embodiments, the particular number of bits reserved for the lower bits depends on the compression rate and the number of bits of the AGC factor. In some embodiments, transmitting the compressed IQ data and the AGC factor may include, as compressed data, every two adjacent compressed IQ data following one bit of the AGC factor.

In step M402, the compressed data may be mapped to CPRI frames for transmission on the optical fiber, which may be performed by the BBU 103. Step M402 may also include determining the CPRI protocol having the line rate closest to the transmission rate of the ethernet. In some embodiments, the method further comprises determining the number of compressed data mapped into the CPRI basic frame according to transmission requirements and the CPRI basic frame structure under the CPRI protocol.

In step M403, one or more received CPRI frames may be mapped into ethernet frames for transmission over the ethernet network line, which may be performed by the RHUB 104. Step M403 may further include: the number of CPRI basic frames mapped to each basic group of ethernet frames is determined. In some embodiments, mapping data contained in each consecutive said number of CPRI basic frames to an IQ data field in a basic group of each ethernet frame is further included. In some embodiments, it also includes mapping the control words 201 contained in the CPRI basic frames to the message channel and control management CM channel in the basic group of ethernet frames.

An indoor distribution system for transmitting data using ethernet according to an embodiment of the present disclosure may include a first electronic device 500 as shown in fig. 5, and the first electronic device 500 may include at least one processor 501 and a memory 502.

The processor 501 provides various functions of the first electronic device 500. The processor 501 may be any processor such as a microprocessor, digital signal processor, microcontroller, multi-core processor, special purpose processor, interface for communication, and the like. Processor 501 may execute various program instructions stored in memory 502 to perform corresponding operations.

In some embodiments, the memory 502 stores executable instructions that when executed by the processor 501 may select a compression method according to the transmission requirement and the transmission rate of the ethernet, and compress the data to be transmitted by using the compression method; and mapping the compressed data to Common Public Radio Interface (CPRI) frames for transmission on the optical fiber. The memory 502 may be any of various types of memory or storage devices. For example, memory 502 may include mounting media (e.g., CD-ROM, floppy disk, or tape devices), random access memory (such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.), non-volatile memory (such as flash memory, magnetic media, or optical storage), registers, or other similar types of memory elements, and so forth. The memory 502 may also include other types of memory or combinations thereof. In embodiments of the present disclosure, the memory 502 may store program instructions (e.g., instructions for performing corresponding operations) to implement methods in accordance with embodiments of the present disclosure in software, hardware, or a combination of software and hardware.

In some embodiments, the indoor distribution system may further include a second electronic device, which may include at least one processor and a memory having stored therein executable instructions that, when executed by the at least one processor, cause the at least one processor to map one or more received CPRI frames into ethernet frames for transmission over an ethernet network line.

In some embodiments, the system may further include a third electronic device, which may include at least one processor and a memory having stored therein executable instructions that, when executed by the at least one processor, cause the at least one processor to receive ethernet frames over ethernet.

In some embodiments, the first electronic device 500 is the indoor baseband processing unit, BBU, 103. In some embodiments, the second electronic device is the remote hub RHUB 104. In some embodiments, the third electronic device is a pico base station remote radio unit, pRRU, 105. In some embodiments, the ethernet network is a gigabit ethernet network.

All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Aspects of the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects all of which may be referred to herein generally as a "circuit," module "or" system. Any combination of one or more computer-readable storage media may be used. The computer readable storage medium may be a computer readable signal medium or a computer readable storage medium.

A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The present disclosure, in various embodiments, configurations, and aspects, includes components, methods, processes, systems and/or apparatus substantially as depicted and described herein, including various embodiments, subcombinations, and subsets thereof. Those of skill in the art will understand how to make and use the systems and methods disclosed herein after understanding the present disclosure. In various embodiments, configurations, and aspects, the present disclosure includes providing devices and processes in the absence of items not depicted and/or described herein or in various embodiments, configurations, or aspects hereof, including in the absence of items that may have been used in previous devices or processes, e.g., for improving performance, achieving ease and/or reducing cost of implementation.

Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

Moreover, although the description of the present disclosure has included description of one or more embodiments, configurations, or aspects, certain variations and modifications, other variations, combinations, and modifications are within the scope of the disclosure, e.g., as may be within the skill and knowledge of those in the art, after understanding the present disclosure. The present disclosure is intended to obtain rights which include alternative embodiments, configurations, or aspects to the extent permitted, including alternate, interchangeable and/or equivalent structures, functions, ranges or steps to those claimed, whether or not such alternate, interchangeable and/or equivalent structures, functions, ranges or steps are specifically set forth herein. Nothing herein is intended to publicly dedicate any patentable technical solution.

Claims

1. A method for transmitting data in an indoor distribution system, the method comprising:

selecting a compression method according to the transmission requirement and the transmission rate of the Ethernet, and compressing the data to be transmitted by adopting the compression method;

mapping the compressed data to a Common Public Radio Interface (CPRI) frame for sending on an optical fiber; and

mapping the received CPRI frames into ethernet frames for transmission over an ethernet network line, wherein the data to be transmitted comprises quadrature-in-phase IQ data obtained by sampling, the compression method comprising:

determining an automatic gain control, AGC, factor for one or more IQ data;

determining the bit number to be shifted for each IQ data according to the bit number represented by the AGC factor, and performing compression processing by respectively removing the corresponding bit number from high bit shift except the highest sign bit for each IQ data and reserving a specific number of bits from the remaining part containing the sign bit to the low bit to obtain compressed IQ data; and

transmitting the compressed IQ data and AGC factors.

2. The method of claim 1, further comprising determining a compression rate based on transmission requirements and a transmission rate of the ethernet network, wherein the transmission requirements include one or more of: the number of cells, the number of antennas, and the cell bandwidth supported by the device.

3. The method of claim 1, wherein determining the AGC factor comprises:

taking the data with the maximum absolute value in the one or more IQ data as a reference value;

searching the reference value from the highest sign bit to the lower bit one by one until the first bit different from the sign bit is searched; and

and binary quantization is carried out on the searched bit number of the bit which is the same as the sign bit except the sign bit, and the bit number is recorded as an AGC factor.

4. The method of claim 1, wherein the particular number depends on a compression rate and a number of bits of the AGC factor.

5. The method of claim 1, wherein transmitting compressed IQ data and AGC factors comprises:

every two adjacent compressed IQ data follow one bit of the AGC factor as compressed data.

6. The method of claim 1, further comprising:

determining a CPRI protocol having a line rate closest to a transmission rate of the ethernet; and

and determining the number of the compressed data mapped into the CPRI basic frame according to the transmission requirement and the CPRI basic frame structure under the CPRI protocol.

7. The method of claim 1, further comprising:

determining the number of CPRI basic frames mapped to each basic group of Ethernet frames;

mapping the data contained in each continuous CPRI basic frame of the number to an IQ data field in a basic group of each Ethernet frame;

the control words contained in the CPRI basic frame are mapped to the message channel and the control management channel in the basic group of ethernet frames.

8. The method of claim 1, wherein the ethernet network is a gigabit ethernet network.

9. An indoor distribution system for transmitting data using ethernet, the system comprising:

a first electronic device, the first electronic device comprising:

at least one processor; and

a memory having executable instructions stored therein that, when executed by the at least one processor, cause the at least one processor to:

selecting a compression method according to the transmission requirement and the transmission rate of the Ethernet, and compressing the data to be transmitted by adopting the compression method; and

mapping the compressed data to a Common Public Radio Interface (CPRI) frame for sending on an optical fiber, wherein the data to be transmitted comprises quadrature in-phase (IQ) data obtained by sampling, and the compression method comprises the following steps:

determining an automatic gain control, AGC, factor for one or more IQ data;

transmitting the compressed IQ data and AGC factors.

10. The system of claim 9, further comprising a second electronic device, the second electronic device comprising:

at least one processor; and

a memory having stored therein executable instructions that, when executed by the at least one processor, cause the at least one processor to: one or more received CPRI frames are mapped into ethernet frames for transmission over the ethernet network line.

11. The system of claim 10, further comprising a third electronic device, the third electronic device comprising:

at least one processor; and

a memory having stored therein executable instructions that, when executed by the at least one processor, cause the at least one processor to: the ethernet frame is received over an ethernet network.

12. The system of claim 11, wherein the first electronic device is an indoor baseband processing unit (BBU), the second electronic device is a Remote Hub (RHUB), the third electronic device is a pico base station remote radio unit (pRRU), and the Ethernet is a gigabit Ethernet.

13. A non-transitory computer readable storage medium having stored thereon executable instructions that, when executed by a processor, perform the method of any one of claims 1-8.

14. An apparatus for transmitting data in an indoor distribution system, the apparatus comprising means for performing the method of any of claims 1-8.